diff --git a/book/_config.yml b/book/_config.yml
index 6040201..88250ed 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -126,6 +126,10 @@ sphinx:                                              # Options passed on to the
     git_exclude_commits: []                          # Default value (line can be removed), sets a list of commit hashes to *skip* in git last updated date checking, configuration part of Sphinx-Last-Updated-by-Git (https://github.com/mgeier/sphinx-last-updated-by-git/)
     sphinx_github_alerts_backquotes: 3               # Default value (line can be removed), sets the number of backticks used to start and end the admonitions, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-GitHub-Alerts/main/README.html)
     sphinx_github_alerts_redirects: {}               # Default value (line can be removed), no redirects are set, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-GitHub-Alerts/main/README.html)
+    suffix_start: start                              # Default value (line can be removed), suffix for the start directive, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-Gated-Directives/main/MANUAL.html)
+    suffix_end: end                                  # Default value (line can be removed), suffix for the end directive, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-Gated-Directives/main/MANUAL.html)
+    suffix_separator: '-'                            # Default value (line can be removed), separator between the original directive name and the suffix, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-Gated-Directives/main/MANUAL.html)
+    override_existing: false                         # Default value (line can be removed), whether to override existing gated directives with the same name, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-Gated-Directives/main/MANUAL.html)
 
 teachbooks:
   attribution_location: top                          # Default value (line can be removed), sets location of attribution admonition of external pages, configuration part of TeachBooks package (https://teachbooks.io/manual/features/external_toc.html)